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A236517 Number of (n+1)X(2+1) 0..1 arrays with the difference of the upper median and minimum value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise 1
52, 264, 1256, 5670, 25023, 108214, 462970, 1962897, 8278491, 34768983, 145652451, 608974557, 2542990472, 10609555831, 44237987228, 184378860260, 768258530698, 3200511193171, 13331394907045, 55525565937033, 231251505598612 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A236523

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 8*a(n-1) -8*a(n-2) -75*a(n-3) +168*a(n-4) +171*a(n-5) -664*a(n-6) +28*a(n-7) +1000*a(n-8) -411*a(n-9) -606*a(n-10) +337*a(n-11) +151*a(n-12) -94*a(n-13) -12*a(n-14) +8*a(n-15)

EXAMPLE

Some solutions for n=4

..0..0..0....0..0..1....1..0..1....0..1..0....0..1..1....1..1..1....0..1..0

..1..0..0....0..0..1....1..1..0....0..1..1....1..0..1....1..0..1....1..1..1

..0..0..1....0..0..1....0..1..0....1..0..1....0..0..0....0..1..1....1..1..0

..1..0..0....1..0..1....1..1..1....1..1..1....0..0..0....1..0..0....1..1..1

..0..0..0....0..0..1....1..0..0....1..1..1....0..1..0....0..1..1....1..1..1

CROSSREFS

Sequence in context: A122239 A086860 A070147 * A320556 A252335 A230533

Adjacent sequences:  A236514 A236515 A236516 * A236518 A236519 A236520

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 27 2014

STATUS

approved

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Last modified January 27 01:03 EST 2021. Contains 340443 sequences. (Running on oeis4.)